The Viessmann 7825533 Heat Exchanger – 12 Plates is a genuine replacement component designed to deliver efficient and reliable heat transfer in compatible Viessmann boiler systems. This 12-plate heat exchanger is engineered to rapidly transfer heat from the boiler’s primary circuit into the domestic hot water and heating circuits, ensuring consistent temperature delivery, strong performance, and energy-efficient operation. Manufactured to Viessmann’s exacting quality standards, it provides durable, long-term reliability when installed by a qualified heating engineer during servicing or repair.

This heat exchanger is compatible with a range of Viessmann combi boiler models that utilise a 12-plate exchanger configuration. It is commonly used where reduced hot water performance, fluctuating temperatures, or internal scaling indicate the need for replacement. Always confirm the exact boiler model and part specification before installation to ensure correct fit and optimal performance.

Using a genuine Viessmann heat exchanger helps restore efficient heat transfer, supports stable hot water and heating delivery under varying demand, and contributes to the long-term dependable operation of your central heating and hot water system.